Artykuły w czasopismach: „Unified strength theory”

1

Yu, M. H., W. Fan, A. L. Che, M. Yoshimine i Takahiro Iwatate. "Application of the Unified Strength Theory in Analyzing Fracture Strength". Key Engineering Materials 261-263 (kwiecień 2004): 111–16. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.111.

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In practical engineering, the cracks are always mixed mode. The research on the mixed fracture criterion has an important significance in fracture mechanics and engineering. Stress state of the mixed mode cracks is complicated. A new unified strength theory considering the effects of all the three principal stresses is generalized into the fracture mechanics in this paper. The complex stress states are common characteristics between the mixed mode cracks and the unified strength theory. A unified fracture function criterion is established by using the unified strength theory in this paper. In the unified fracture function, the difference between tension and pressure and the effect of the intermediate principal stress σ2are considered. With the variation of α = σt/ σcand failure parameter b , a series of mixed mode crack criteria are formed, and can be applied for many materials. The J-integral is calculated through FEM. According to the relation between the result and the stress intensity factor, Klccan be obtained. Then it is used in the unified fracture function. The unified fracture criterion is compared with those of other mixed mode criterions.

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Kolupaev, V. A., M. H. Yu i H. Altenbach. "Visualization of the Unified Strength Theory". Archive of Applied Mechanics 83, nr 7 (9.02.2013): 1061–85. http://dx.doi.org/10.1007/s00419-013-0735-8.

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Ma, Zong Yuan, Hong Jian Liao i Mao Hong Yu. "Slope Stability Analysis Using Unified Strength Theory". Applied Mechanics and Materials 137 (październik 2011): 59–64. http://dx.doi.org/10.4028/www.scientific.net/amm.137.59.

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Numerical computations using finite difference method and unified strength theory are reported to analyze the slope stability problem. The Factor of safety of plane strain and axisymmetric slopes was calculated by strength reducing method, and the influences of intermediate principal stress on slope stability problem was analyzed. The associative and non-associative flow rule was taking into account in plane strain slope problem analysis. The intermediate principal stress has equivalent influences on slope stability problem under associative and non-associative flow rule. The Factor of safety of plane strain slope is lower than the axisymmetric situation. The influence of intermediate principal stress on slope stability under plane strain condition is heavier than axisymmetry.

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4

Li, Xiao Wei, Jun Hai Zhao i Wei Chen. "Stresses Unified Solution for Wire Forming Based on Unified Strength Theory". Advanced Materials Research 472-475 (luty 2012): 835–38. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.835.

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For known well the contributions of both tension-compression-ratio of material and intermediate principal shear stress to wire forming, the wire forming problem is developed based on unified strength theory. By denoting a notation of D, the unified stresses solution for wire forming is gained, which is suitable to both wire drawing and extrusion. In addition, when material has identical strength in tension and compression, the stresses solution based on unified strength theory become that based on unified yield criterion. Notably, it is proved that the stresses of wire forming are independent of the intermediate principal shear stress. Whether any yield criterion (e.g., Mises, Tresca or unified yield criterion) is adopted, for it is assumed that the tensile and compressive strength is equal to one another, the stresses solution is as same as that based on unified yield criterion, and is merely a special case of the unified stresses solution developed by this paper.

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Li, Yuan, Qi Liang Liu i Qing Chi Cai. "Unification of Hoek-Brown Criterion on the Basis of United Strength Theory". Applied Mechanics and Materials 501-504 (styczeń 2014): 415–18. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.415.

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Based on twin failure mechanism of fracture and shear , the bilinear transitional strength decomposition formula reflecting the nonlinear strength of rock material is proposed,.The decomposed brittle shear formula is integrated and finally the unified strength theory formula characterized by nonlinearity of Hoek-Brown criterion is established. It makes the unified strength theory characterized by nonlinearity of empirical strength criterion, rock mass strength reduction, etc. Besides, it contributes to promote the accuracy and applicability of unified strength theory in rock strength and rock mass strength,especially for the hard rock failure analysis.

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Zhou, Xuan, Guo Jian Shao i Feng Hu. "Ultimate Bearing Capacity Based on Unified Strength Theory". Applied Mechanics and Materials 368-370 (sierpień 2013): 1838–42. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1838.

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In the ultimate bearing capacity formulas, the factor Nγ has not been given a definite expression, so the calculation diagrams are not serious and the hypothesis can’t match the reality. Most of the ultimate bearing capacity factors are received from the results of Prandtl theory, but the theoretic models they used are not the same. And most of the ultimate bearing capacity theories are based on Mohr-Coulomb theory, the effects of intermediate principle stress are ignored. To solve these problems, according to ultimate balance theory and unified strength theory, the analytical formulas of ultimate bearing capacity and Nγ are received when foundation is completely smooth. The results show that the ultimate bearing capacity will increase when considering the effects of intermediate principle stress and the formulas from practical experiences can make the ultimate bearing capacity unsteady.

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Yu, Mao-Hong, V. A. Kolupaev, Yue-Ming Li i Jian-Chun Li. "Advances in Unified Strength Theory and its Generalization". Procedia Engineering 10 (2011): 2508–13. http://dx.doi.org/10.1016/j.proeng.2011.04.413.

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LIAO, HONGJIAN, ZONGYUAN MA i LIJUN SU. "CALCULATION OF THE ULTIMATE BEARING CAPACITY OF SOIL SLOPE BASED ON THE UNIFIED STRENGTH THEORY". International Journal of Modern Physics B 22, nr 31n32 (30.12.2008): 5637–42. http://dx.doi.org/10.1142/s0217979208050930.

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At present, the failure criteria used in calculating the ultimate bearing capacity of soil slope are the Tresca and Mohr-Coulomb criteria. But the results are conservative and the potential strength of soil mass cannot be utilized sufficiently because these two criteria do not take into account the effect of the intermediate principal stress. In this paper the unified strength theory was used to analyze the ultimate bearing capacity of soil slope. The formula for calculating the ultimate bearing capacity of soil slope using the unified strength theory was established. At the end, a case history was analyzed and it indicated that the result of the unified strength theory is larger than that of the Mohr-Coulomb criterion. This indicates that calculation of ultimate bearing capacity of soil slope with the unified strength theory can sufficiently exploit the strength of material. Therefore, the calculation of ultimate bearing capacity of the soil slope based on the unified strength theory will be of great significance in future applications.

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Wang, Xiang Qiu, i Wen Tao Yang. "Study on the Bearing Capacity of Slime Friction Pile Based on the Double-Sheared Theory". Applied Mechanics and Materials 353-356 (sierpień 2013): 1005–10. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1005.

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The bearing capacity of slime friction pile based on the Mohr-Coulombs strength criterion couldnt make full use of the potential strengths ability of rock-soil. But the double shear unified strength theory can depict really the bearing characteristics of rock-soil because it can consider the effect of intermediate principal stress comprehensively. On this condition, based on the Mindlins displacement solution and the double shear unified strength theory, a calculated formula of bearing capacity was proposed for the slime friction pile, and then the distribution regularities of lateral friction-resistance force for the slime friction pile were discussed.

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Wang, Peng, i Shaoxing Qu. "Analysis of ductile fracture by extended unified strength theory". International Journal of Plasticity 104 (maj 2018): 196–213. http://dx.doi.org/10.1016/j.ijplas.2018.02.011.

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Lin, Chen, i Yue-Ming Li. "A return mapping algorithm for unified strength theory model". International Journal for Numerical Methods in Engineering 104, nr 8 (10.06.2015): 749–66. http://dx.doi.org/10.1002/nme.4937.

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Zhang, Xue Ying. "Study on Rockmass Deterioration Model Based on the Unified Strength Theory". Advanced Materials Research 468-471 (luty 2012): 2521–27. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.2521.

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Strain softening model;Unified strength theory;Rockmass deterioration model;FLAC3D Abstract:Aiming at the problem that traditional elasto-plastic constitutive models have not been successful in predicting the depth and extent of brittle failed of hard rocks under high geo-stress condition, a new rockmass deterioration model(RDM) based on the unified strength theory is put forward in the basis of strain softening model and cohesion weaking and friction strengthening (CWFS)model. In the new model, the influence of intermediatemain stress to characteristic of rockmechanics is considered. Based on the method of lagrangian finite difference, a finite difference format of unified strain- softening elastoplastic model with strength parameters of c and φ is established. The constitutive unified elastoplastic model is imported into FLAC3D using a dynamic-link library file developed by VC++.Based on the new model, the traditional triaxial tests (with different confining pressure) and true triaxial tests (with intermediate principal stress ratio) are simulated in FLAC3D, and the measured data are compared with the results that are are simulated by strain softening model and CWFS model. The analytic results suggest that the rockmass deterioration model based on the twin shear unified strength theory has more strong applicability

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Zhang, ChangGuang, JiangFeng Wang i JunHai Zhao. "Unified solutions for stresses and displacements around circular tunnels using the Unified Strength Theory". Science China Technological Sciences 53, nr 6 (czerwiec 2010): 1694–99. http://dx.doi.org/10.1007/s11431-010-3224-0.

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Lin, Yuanhua, Kuanhai Deng, Yongxing Sun, Dezhi Zeng, Wanying Liu, Xiangwei Kong i Ambrish Singh. "Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory". PLoS ONE 9, nr 11 (14.11.2014): e111426. http://dx.doi.org/10.1371/journal.pone.0111426.

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Tang, Yao, i Ping Tang. "Upper Bound Solution for Ultimate Bearing Capacity of Foundation Based on Unified Strength Theory". Advanced Materials Research 446-449 (styczeń 2012): 1751–54. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1751.

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Based on unified strength theory, an upper bound solution for bearing capacity of foundation is established considering the strength of soil above the basement by using Prandtl slip model. The proposed method could be degenerated to classical slip-line method in some certain situations. A series of results could be presented by means of changing the parameters of unified strength theory. The results obtained by this proposed method are greater than those by Terzaghi method, which is mainly because the positive effects of soil strength above foundation base. Since unified strength theory could be simplified to Mohr-Coulomb strength theory in a certain situation, the results are close to those obtained by Meyerhof method. This proposed solution can consider the effects of intermediate principal stress so that we can make full use of the potential capacity of soil, which is a rigorous upper-bound solution. Other solutions are special cases of this proposed solution.

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16

SONG, LI, CHONGDU CHO, SHENG LU i HONGJIAN LIAO. "STUDY ON SOFTENING CONSTITUTIVE MODEL OF SOFT ROCK USING STRAIN SPACE BASED UNIFIED STRENGTH THEORY". International Journal of Modern Physics B 22, nr 31n32 (30.12.2008): 5375–80. http://dx.doi.org/10.1142/s0217979208050528.

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This study attempts to modify the unified strength theory by considering compression as a positive load in geotechnical engineering. It also aims to establish a unified elastoplastic strain softening constitutive model which can accurately describe the strain softening behavior of one kind of soft rocks distributed in Japan. The hardening function parameters of the unified elastoplastic strain softening constitutive model are determined from experiments. In addition, numerical simulations of this model are performed to compare the pre-peak, post-peak and the residual strengths of soft rock predicted by this study and experimental results. Simulation results demonstrated that the proposed constitutive equations in strain space can well describe the softening behavior and accurately predict the peak and residual strengths of soft rock. While the proposed equation is applicative for normally consolidated state and overconsolidated state according to the simulation results.

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Li, Hang Zhou, Hong Jian Liao, Bo Han i Li Song. "A Nonlinear Constitutive Model for Soil under Complex Stress State". Key Engineering Materials 535-536 (styczeń 2013): 561–64. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.561.

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It is fundamental to predict the stress-strain behavior of soils to control the stability of the geotechnical engineering. A Duncan-Chang constitutive model is analyzed and found that it ignores the effect of the intermediate principal stress. A unified strength theory is investigated and revised. The lode parameter is introduced into the unified strength theory. The unified friction angle and cohesion which may reflect the influence of the intermediate principal stress and verified by the polyaxial tests are obtained. The compressive strength revised from the unified strength theory is used to replace the Mohr-Coulomb criterion and introduced into the Duncan-Chang model. A modified constitutive model is proposed, which is verified by the plane strain tests. The result shows that the modified constitutive can reflect the effect of the intermediate principal stress, and the Duncan-Chang model is a special case of the modified model when b=0.

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Li, Xiao Wei, Jun Hai Zhao i Qi Yao Wang. "Unified Stresses Solution for Sheet Forming". Advanced Materials Research 463-464 (luty 2012): 629–33. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.629.

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Based on unified strength theory, the unified stresses solution for sheet forming is presented according to mechanical analysis developed, and accurate enough for much material due to the contributions of both intermediate principal shear stress and varying tension-compression-ratio included. Notably, by denoting a notation of h, the expressions presented to estimate stresses of billet for sheet forming can be apply to both drawing and extrusion. In addition, when material has identical strength in tension and compression, i.e., the tension-compression-ratio of the material is equal to unit, the stresses solution based on unified strength theory become that based on unified yield criterion. Accordingly, it can be proved that the stresses solution based on Mises criterion is just a special case of that based on unified yield criterion.

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Yang, Qun, Lu Chen, Ping Wang i Jingwang Dai. "New asphalt pavement failure criterion based on unified strength theory". Journal of Wuhan University of Technology-Mater. Sci. Ed. 30, nr 3 (czerwiec 2015): 528–32. http://dx.doi.org/10.1007/s11595-015-1184-8.

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Schurgin, Mark W., John T. Wixted i Timothy F. Brady. "Psychophysical scaling reveals a unified theory of visual memory strength". Nature Human Behaviour 4, nr 11 (7.09.2020): 1156–72. http://dx.doi.org/10.1038/s41562-020-00938-0.

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Kolupaev, Vladimir A., i Holm Altenbach. "Einige Überlegungen zur Unified Strength Theory von Mao-Hong Yu". Forschung im Ingenieurwesen 74, nr 3 (29.05.2010): 135–66. http://dx.doi.org/10.1007/s10010-010-0122-3.

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Zhang, Mingyue, Yingying Zhang, Guangchun Zhou i Hanyin Li. "Essential Design Strength and Unified Strength Condition of ETFE Membrane Material". Polymers 14, nr 23 (27.11.2022): 5166. http://dx.doi.org/10.3390/polym14235166.

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This study proposes essential design strength and unified strength condition for ETFE membrane materials based on the structural state-of-stress theory and formula of strength. Firstly, the tested strain data of the uniaxial rectangle-shaped specimen are modeled to obtain its state-of-stress characteristic parameter. Then, the characteristic points in the evolution curve of the characteristic parameter are detected by the cluster analysis (CA) criterion. The characteristic points are the embodiment of the natural law from quantitative change to qualitative change of a system, which define the essential strength and the essential design strength of ETFE membrane materials. Further, the essential principal stresses are derived at the characteristic points in the evolution curves of the characteristic parameters obtained by the state-of-stress analysis of the strain data from the tests of air bubbling models and cruciform specimens. Both essential principal stresses and essential strength lead to the unified formula of strength for ETFE membrane materials. Additionally, the unified strength condition is derived for the design of ETFE membrane material structures. Finally, the essential strength, essential design strength, and the unified strength conditions are compared with the existing conditions, providing a rationality to update the existing analysis and design methods for determining the strength of ETFE membrane materials.

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Zhou, Rong, Jun Hai Zhao i Xue Ying Wei. "Research on Bearing Capacity of Concrete Filled Double Skin (CHS Inner and SHS Outer) under Eccentric Compression". Applied Mechanics and Materials 723 (styczeń 2015): 422–26. http://dx.doi.org/10.4028/www.scientific.net/amm.723.422.

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The ultimate load calculation formula for the solid multi barrel tube-confined concrete columns (CHS inner and SHS outer) was derived based on the Unified Strength Theory (UST) in this paper. The influence of intermediate principal stress and the double restriction effect and the decrease of longitudinal stress were considered in the formula. Based on the axial compression load and consider the eccentricity ratio and slenderness ratio, by introducing the reduction factor of concrete strength and the equivalent restriction reduction factor, based on unified strength theory solutions of thick tube, combined with concrete filled skin tube unified theory, deduce the calculation formula of eccentric compression bearing capacity of concrete filled steel tubular columns and analysis the influence complication.

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Zhou, Pei. "A series of equivalent area circle yield criteria based on unified strength theory". E3S Web of Conferences 293 (2021): 02019. http://dx.doi.org/10.1051/e3sconf/202129302019.

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Unified strength theory considering the influence of the intermediate principal stress is widely used in geotechnical engineering, but the singularities bring inconvenience to the numerical calculation. A series of equivalent area circle yield criteria based on unified strength theory are derived. The parameters of the new yield criteria and Drucker-Prager criteria are discussed, and the flow vector coefficients of the new yield criteria are given. The new series of yield criteria are very convenient for numerical calculation and can be served as reference for the evaluation of the effects of strength theory.

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Xia, Gui Yun, Jia Jun Li i Mei Liang Yang. "Load-Bearing Capacity of CFDST Based on the Unified Strength Theory". Applied Mechanics and Materials 204-208 (październik 2012): 4031–37. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4031.

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Based on the unified strength theory presented by Maohong Yu, the calculating formula for the load-bearing capacity of concrete-filled double steel tube was derived. Through tests, the calculating load-bearing capacity results were compared with testing results, which agreed well. The change of load-bearing capacities with parameter k of the unified strength theory was discussed. It can be drawn that the load-bearing capacity of CFDST will increase with the increase of parameter b, but the increase is not obvious.

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Zhou, Feng Xi, i Shi Rong Li. "Generalized Drucker-Prager Strength Criteria". Key Engineering Materials 353-358 (wrzesień 2007): 369–72. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.369.

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Based on the experimental and theoretic studies of the frictional materials in literatures, a generalized non-linear strength theory is presented. The generalized strength theory has the same mathematical form as classical Drucker-Prager strength (D-P) criteria. It describes strength characteristics of various materials using a unified formula, and it includes or approximates numerously present strength criterions. The shape of generalized Drucker-Prager (GDP) criteria is convexly smooth curve between the classical D-P criteria (upper bound) and the external contour line of Mohr-Coulomb (M-C) criteria (lower bound) on the deviator-plane, and a straight line on the meridian-plane. Through variation of parameters in the criteria, a series of criterions ranging between these two bounds may be introduced by the unified strength criteria, and the different strength properties of various materials were denoted.

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Zhao, Jun-hai, Yue Zhai, Lin Ji i Xue-ying Wei. "Unified Solutions to the Limit Load of Thick-Walled Vessels". Journal of Pressure Vessel Technology 129, nr 4 (20.10.2006): 670–75. http://dx.doi.org/10.1115/1.2767356.

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Unified solutions to the elastoplastic limit load of thick-walled cylindrical and spherical vessels under internal pressure are obtained in terms of the unified strength theory (UST) and the unified slip-line field theory (USLFT). The UST and the USLFT include or approximate an existing strength criterion or slip-line field theory by adopting a parameter b, which varies from 0 to 1. The theories can be used on pressure-sensitive materials, which have the strength difference (SD) effect. The solutions, based on the Tresca criterion, the von Mises criterion, the Mohr–Coulomb criterion, and the twin shear strength criterion, are special cases of the present unified solutions. The results based on the Mohr–Coulomb criterion (b=0) give the lower bound of the plastic limit load, while those according to the twin shear strength criterion (b=1) are the upper bound. The solution of the von Mises criterion is approximated by the linear function of the UST with a specific parameter (b≈0.5). Plastic limit solutions with respect to different yield criteria are illustrated and compared. The influences of the yield criterion as well as the ratio of the tensile strength to the compressive strength on the plastic limit loads are discussed.

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Li, Yan, Jun Hai Zhao, Qian Zhu, Chang Guang Zhang, Wen Qi Bai i Jian Feng Xu. "Stability Analysis of Unsaturated Soil Slopes Based on Unified Strength Theory". Applied Mechanics and Materials 353-356 (sierpień 2013): 946–51. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.946.

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Based on the unified solution of shear strength in terms of double stress state variables for unsaturated soils, the unified formula of stability coefficient for unsaturated soil slopes under the plane strain condition is derived by Sweden slice method, which considers the effect of the intermediate principal stress rationally. Combining with engineering example, the proposed formula is compared with the one that is on the basis of Fredlund unsaturated soil theory and the influencing characteristics of factors including intermediate principal stress, matric suction, effective internal friction angle and matric suction angle is obtained. The research result indicates that: intermediate principal stress and matric suction have obvious impacts on the stability coefficient for unsaturated soil slopes; the stability coefficient has been increasing with the increase of unified strength theory parameter and matric suction, which proves that the consideration of intermediate principal stress and matric suction can make slopes give full play to their self-stabilities and strength potential, and the yield criterion has great impact on the judgment of slope stability; the stability coefficient also increases nonlinearly with the increase of effective internal friction angle and matric suction angle. The proposed unified formula of stability coefficient for unsaturated soil slopes enjoys a wider application. The stability coefficient for unsaturated soil slopes according to the Fredlund unsaturated soil theory and that for saturated soil slopes are just the special cases. The research result can provide theoretical basis for stability analysis and reinforce design of the unsaturated soil slopes, and it is of great significance to the slope management.

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Li, Xiao Wei, Jun Hai Zhao i Qi Yao Wang. "Maximum Reduction in Thickness in a Single Sheet Forming Pass Based on Unified Strength Theory". Applied Mechanics and Materials 159 (marzec 2012): 151–55. http://dx.doi.org/10.4028/www.scientific.net/amm.159.151.

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Based on unified strength theory, the equation for estimating the maximum reduction in thickness in a single sheet forming pass is obtained. Included the contribution of both intermediate principal shear stress and varying tension-compression-ratio to material mechanical property, the equation developed by this paper can reasonably apply to a wide range of material. It can be proved that the equation for estimating the maximum reduction based on unified strength theory becomes that based on unified yield criterion, when material has equal strength in tension and compression, i.e., the tension-compression-ratio of material is equal to units; and, that the values of the maximum reduction obtained previously based on Mises, or Tresca criterion, are all just special cases of those based on unified yield criterion. In addition, the maximum reduction in thickness for sheet drawing and extrusion is equal to one another.

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Yu, Mao-hong. "Advances in strength theories for materials under complex stress state in the 20th Century". Applied Mechanics Reviews 55, nr 3 (1.05.2002): 169–218. http://dx.doi.org/10.1115/1.1472455.

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It is 100 years since the well-known Mohr-Coulomb strength theory was established in 1900. A considerable amount of theoretical and experimental research on strength theory of materials under complex stress state was done in the 20th Century. This review article presents a survey of the advances in strength theory (yield criteria, failure criterion, etc) of materials (including metallic materials, rock, soil, concrete, ice, iron, polymers, energetic material, etc) under complex stress, discusses the relationship among various criteria, and gives a method of choosing a reasonable failure criterion for applications in research and engineering. Three series of strength theories, the unified yield criterion, the unified strength theory, and others are summarized. This review article contains 1163 references regarding the strength theories. This review also includes a brief discussion of the computational implementation of the strength theories and multi-axial fatigue.

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Han, Ju Hong, i Dun Bin Wang. "The Analysis of Punching Shear Strength for Concrete Slabs Based on the Unified Strength Theory". Advanced Materials Research 919-921 (kwiecień 2014): 1853–59. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1853.

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Based on the mechanism of punching shear and patterns of failure of Specimen,using the unified strength theory and rigid-plastic models,the punching strength of reinforced concrete slabs supported on four sides is obtained.The theoretical formula of punching shear strength for concrete slab is given.The calculated results are in good agreement with the experimental results.

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Huang, Wei, Cheng Hua Zhang, Qian Feng Yao, Guo Xin Chen i Hao Zhen Wu. "Calculation Analysis on Cracking Load of New Type Composite Wall". Advanced Materials Research 163-167 (grudzień 2010): 1012–18. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1012.

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New type composite wall is the main bearing member in Multi-ribbed Slab Structure (MRSS), whose cracking load is an important parameter to determine the restoring force model and damage index of the wall. Based on the twin shear unified strength theory, when the influence of intermediate principal stress σ2 and SD effect of materials are considered, the study on low-frequency cyclic lateral loading experiment of wall is proceed and the practical formula for the wall’s initial cracking load is deduced. The practical computing formulas for the wall’s initial cracking load based on twin shear unified strength theory and maximum tensile stress theory are contrastingly analyzed. The results show that, comparing the calculated values based on the twin shear unified strength theory and the values based on maximum tensile stress theory, the former are more closed to the experimental values, and it can provide more accurate, economic and applicable results for practical engineering.

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Liu, Zhi Jie, Jun Hai Zhao, Xu Guang Yu, Gai Qin Su i Xin Zhao. "The Square Steel Tube Columns Filled with Steel-Reinforced Concrete Bias Supporting Capacity Unified Solution". Applied Mechanics and Materials 193-194 (sierpień 2012): 1418–23. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.1418.

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The eccentric ultimate load calculation formula of square steel tube columns filled with steel-reinforced concrete was derived based on the Unified Strength Theory in this paper. The influence of intermediate principal stress and the restriction effect and the decrease of longitudinal stress were considered in the formula. Based on the axial compression load and the effect of consider the eccentricity ratio and slenderness ratio on the hearing capacity was considered, by introducing the reduction factor of concrete strength and the equivalent restriction reduction factor, the confinement of square steel tube towards concrete was equivalent to the confinement of circular steel tube towards it, based on unified strength theory solutions of thick tube, the calculation formula of eccentric compression bearing capacity of square steel tube columns filled with steel-reinforced concrete was deduced and analysed the influence complication. The results indicate unified strength theory has the good applicability and the solution has an important practical value for engineering application.

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Ma, Qing, Jun Hai Zhao i Zhao Liu. "Elastic-Plastic Solution of Circular Tunnel Based on Unified Strength Theory". Applied Mechanics and Materials 90-93 (wrzesień 2011): 1965–72. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1965.

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φThe circular tunnel is a common structure in civil engineering. Mohr-Coulomb strength theory has been used to analyses pressure tunnel in the field of rock engineering for many years. Because it could only solve the problems with one kind of material, the application of the theory was greatly restricted. In this paper, the formulas calculating yield range and stresses are deduced based on the proper choice of the first principal stress used in the unified strength theory according to loads and in-situ stresses. The applicability formulas is gained based on the critical pressures, which can be obtained in other situations or strength thoeries simplified by assuming the parameter value in the formula. An example is analyzed, and the yield range versus the inner pressure and stress distribution are presented. Results are compared to those based on the traditional method and significant disparity is observed. The results indicate that the coefficient b, cohesion c, friction angle φ all have significant influences on the yield range and stresses.

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Deng, Longsheng, Wen Fan i Maohong Yu. "Parametric study of a loess slope based on unified strength theory". Engineering Geology 233 (styczeń 2018): 98–110. http://dx.doi.org/10.1016/j.enggeo.2017.11.009.

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Falci, G., Gerd Schön i Gergely T. Zimanyi. "Unified Scaling Theory of the Electron Box for Arbitrary Tunneling Strength". Physical Review Letters 74, nr 16 (17.04.1995): 3257–60. http://dx.doi.org/10.1103/physrevlett.74.3257.

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Zhou, Guangchun, Jun Shi, Maohong Yu, Yu Zhang, Xiaochun Li i Yan Zhao. "Strength without Size Effect and Formula of Strength for Concrete and Natural Marble". Materials 12, nr 17 (22.08.2019): 2685. http://dx.doi.org/10.3390/ma12172685.

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Throughout the several-hundred-year-long history of the concept of strength, inaccurate material strength as a result of the size effect and the inconsistency of strength theories have been two continuous and challenging issues, and have even been taken to be inherent attributes of material strength. Applying the structural stressing state theory and method, this study experimentally investigates the uniaxial load-bearing process of concrete specimens and reveals their stressing state mutation features at specific load levels. Exploration of this general feature resulted in the discovery of essential strength, which is basically without size effect. Then, biaxial and triaxial experiments with concrete specimens were conducted in order to obtain the results for various combinations of principal stresses on essential strength. Consequently, according to Yu’s unified strength theory, the formula for strength of concrete was determined by fitting the relation between the combined principal stresses and the essential strength, which was verified by experiments carried out using natural marble specimens. Essential strength could promote the accuracy of strength indices, and the formula for strength might replace the existing strength theories for brittle materials. The initial solution of these two classic issues could make a new contribution to Yu’s unified strength theory and its final goal, promoting related research on material strength and leading to a more rational use of material strength in practical engineering.

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Ma, Qing, Jun Hai Zhao i Dong Fang Zhang. "Elastic-Plastic Analytical Solution of Deep-Buried Circle Pervious Tunnel Based on Unified Strength Theory". Advanced Materials Research 602-604 (grudzień 2012): 2155–62. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2155.

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Mohr-Coulomb strength theory has been used to analyses the elastic-plastic analytical solution of pressure tunnel in the field of rock engineering for many years. Because it could only solve the problems with one kind of material, the application of the theory was greatly restricted. In order to reflect the effects of stress redistribution, the stress adjustment coefficient is introduced in this paper to develop the elastic-plastic analytical solution of deep buried circle tunnel based on the unified strength theory. The applicability formulas is gained based on the critical pressures, which can be obtained in other situations or strength thoeries simplified by assuming the parameter value in the formula. An example is analyzed, and the yield range versus the inner pressure and stress distribution are presented. The results show that the parameter in unified strength theory has significant effects on the radius of plastic zone and the magnitude of stresses of the wall rock of tunnel, comparing with theory of Mohr-Coulomb.

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Deng, Zhiheng, Jingkai Zhou, Beiquan Chen, Xiaoyan Wen i Bing Liu. "Triaxial Compression Performance Research of Steel Slag Concrete on the Unified Strength Theory". Applied Sciences 11, nr 1 (24.12.2020): 128. http://dx.doi.org/10.3390/app11010128.

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To better explore the mechanical properties of steel slag concrete (SSC) under triaxial compression, true triaxial tests were performed on SSC with three replacement ratios (30%, 70%, 100%) by a servo-controlled setup (TAWZ-5000/3000). Through the test, failure modes, peak stress, and corresponding strain of SSC are obtained. Results show that the failure modes of SSC are plate-splitting and slant-shear. Compared with the corresponding uniaxial strength, the triaxial compressive strength of SSC is significantly improved and is influenced by the stress ratio and the replacement ratio. Finally, based on unified strength theory, the strength failure criterion formula of SSC with different replacement rates under triaxial compression is given.

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Zhu, Qian, Jun Hai Zhao, Yan Li, Peng Wu i Su Wang. "Axial Compression Performance Research of RPC Filled Steel Tube Columns Based on the Unified Strength Theory". Applied Mechanics and Materials 351-352 (sierpień 2013): 337–41. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.337.

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With consideration of the intermediate principal stress,the calculation formula of bearing capacity of RPC filled steel tube columns under axial compression is deduced based on the twin shear unified strength theory. Combining with the bond-slip theory,new ultimate bearing capacity formula is derived with the highest regard for bond stress. Compared with the theoretical result and the experimental data,good agreement can be found. The results show that unified strength theory and the bond-slip theory are versatile in theoretical analysis of the column. The analysis results can be provided for the optimum design of RPC filled steel tube and the solution has an important practical value for engineering application.

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Yan, Chuanliang, Jingen Deng, Lianbo Hu i Baohua Yu. "Fracturing Pressure of Shallow Sediment in Deep Water Drilling". Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/492087.

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The shallow sediment in deep water has weak strength and easily gets into plastic state under stress concentration induced by oil and gas drilling. During drilling, the formation around a wellbore can be divided into elastic zone and plastic zone. The unified strength theory was used after yielding. The radius of the plastic zone and the theoretical solution of the stress distribution in these two zones were derived in undrained condition. The calculation model of excess pore pressure induced by drilling was obtained with the introduction of Henkel’s excess pore pressure theory. Combined with hydraulic fracturing theory, the fracturing mechanism of shallow sediment was analyzed and the theoretical formula of fracturing pressure was given. Furthermore, the influence of the parameters of unified strength theory on fracturing pressure was analyzed. The theoretical calculation results agreed with measured results approximately, which preliminary verifies the reliability of this theory.

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Wang, Li-Cheng. "Multi-axial strength criterion of lightweight aggregate (LWA) concrete under the Unified Twin-shear strength theory". Structural Engineering and Mechanics 41, nr 4 (25.02.2012): 495–508. http://dx.doi.org/10.12989/sem.2012.41.4.495.

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LIN, Yuanhua, Kuanhai DENG, Yongxing SUN, Dezhi ZENG i Tianguo XIA. "Through-wall yield collapse pressure of casing based on unified strength theory". Petroleum Exploration and Development 43, nr 3 (czerwiec 2016): 506–13. http://dx.doi.org/10.1016/s1876-3804(16)30059-3.

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Wang, Yan-bin, Mao-hong Yu, Yun Xiao i Lin-sheng Li. "Dynamic plastic response of a circular plate based on unified strength theory". International Journal of Impact Engineering 31, nr 1 (styczeń 2005): 25–40. http://dx.doi.org/10.1016/j.ijimpeng.2003.10.037.

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Zhang, Y. Q., H. Hao i M. H. Yu. "A Unified Characteristic Theory for Plastic Plane Stress and Strain Problems". Journal of Applied Mechanics 70, nr 5 (1.09.2003): 649–54. http://dx.doi.org/10.1115/1.1602484.

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Based on the unified strength criterion, a characteristic theory for solving the plastic plane stress and plane strain problems of an ideal rigid-plastic body is established in this paper, which can be adapted for a wide variety of materials. Through this new theory, a suitable characteristic method for material of interest can be obtained and the relations among different sorts of characteristic methods can be revealed. Those characteristic methods on the basis of different strength criteria, such as Tresca, von Mises, Mohr-Coulomb, twin shear (TS) and generalized twin shear (GTS), are the special cases (Tresca, Mohr-Coulomb, TS, and GTS) or linear approximation (von Mises) of the proposed theory. Moreover, a series of new characteristic methods can be easily derived from it. Using the proposed theory, the influence of yield criterion on the limit analysis is analyzed. Two examples are given to illustrate the application of this theory.

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Zhang, Ning, Haomin Guo, Tahir Khan, Erhao Zhu, Shaoshuai Shi, Qingliang Wu, Yinliang Tian i Xiaokun Xie. "Elastoplastic Analysis of Two-Layered Circular Lining Based on the Unified Strength Theory". Mathematical Problems in Engineering 2018 (2.10.2018): 1–10. http://dx.doi.org/10.1155/2018/4949364.

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Based on the Unified Strength Theory (UST), elastoplastic analysis of the two-layered circular lining is carried out. The stresses, displacements, and the elastic and plastic zones in both layers are discussed under different values of Young’s moduli of the inner and outer layers. The results reveal that, compared to the single-layered lining, the tangential stress distributions in the two-layered linings are more reasonable along the radial direction, which is beneficial to enhance the overall elastic and plastic ultimate bearing capacities. When considering the intermediate stress (i.e., the axial load), the elastic ultimate bearing capacity will be higher. However, the plastic ultimate bearing capacity remains unchanged. Moreover, a comparison between the Unified Strength Theory and Tresca Criterion is analyzed as well.

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Shen, Yanfei, i Yongqing Tu. "Flexural Strength Evaluation of Multi-Cell Composite T-Shaped Concrete-Filled Steel Tubular Beams". Materials 14, nr 11 (26.05.2021): 2838. http://dx.doi.org/10.3390/ma14112838.

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The multi-cell composite T-shaped concrete-filled steel tubular (MT-CFST) element is an innovative structural form. It has great potential for construction applications because of favorable advantages over traditional composite elements. The flexural strength of MT-CFST beams was investigated in this study to provide recommendations in line with existing design codes. First, formulations to evaluate the flexural strength of MT-CFST beams were derived based on the Unified Theory and plastic stress distribution method (PSDM). For the Unified Theory-based formula, a modified confinement effect factor that considers the shape of a cross-section was proposed. An experimental study on the flexural behavior of six MT-CFST beams as well as two hollow section counterparts was conducted. The influence of bending moment direction, concrete infill, wall thickness, and cross-section sizes were investigated. The accuracy of the proposed formulations was verified against the test results and numerical results from finite element modeling. The comparisons showed that the formula in line with the Unified Theory provided more accurate predictions with reasonable conservatism for the studied MT-CFST beams.

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Wu, Sai, Jun Hai Zhao i Xue Ying Wei. "Study on Ultimate Bearing Capacity of Reinforced Concrete Columns Combined with FRP". Applied Mechanics and Materials 94-96 (wrzesień 2011): 820–25. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.820.

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This paper based on the unified strength theory, analyzed the ultimate bearing capacity of the reinforced concrete columns combined with FRP under axial loads. First, analyzed the mechanical property of the RC columns combined with FRP. Second, based on the unified strength theory, deduced the three-direction compressive stress of the core concrete and got the unified formula for calculating the ultimate bearing capacity of RC columns combined with FRP. Last, compared the analytical results obtained in this paper with the relevant experimental data, good agreement can be found and it proved the good applicability of the formula. Comparing with other methods in calculating the ultimate bearing capacity of RC columns combined with FRP，this method is well-founded, so it has a significant value in analysis of RC columns combined with FRP.

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Zhang, Chang Guang, Dong Hui Zhu, Zhi Gao, Guang Wei Xue i Zheng Li. "Unified Solution of Passive Earth Pressure for Unsaturated Soils". Advanced Materials Research 594-597 (listopad 2012): 430–33. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.430.

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With two different distributions of matric suction, the unified solution of passive earth pressure for unsaturated soils is obtained, which is based on the unified shear strength for unsaturated soils in terms of two independent state stress variables and could avoid some shortages of Rankine's passive earth pressure. The influence of intermediate principal stress and matric suction on passive earth pressure is discussed. The results show that the passive earth pressure increases significantly with the unified strength theory parameter or matric suction increasing, and does not change more rapidly when matric suction decreases linearly with depths than that is constant.

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Zhou, Rong, Jun Hai Zhao i Xue Ying Wei. "Analysis on Bearing Capacity of Concrete-Filled Tubular CFRP-Steel Stub Column under Axle Compression". Applied Mechanics and Materials 584-586 (lipiec 2014): 1155–60. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1155.

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New progress of research and applications of CFRP at home and abroad are introduced in this paper. The circular concrete-filled tubular CFRP-steel stub column under axial loads is studied based on the unified strength theory in the paper. The effect of intermediate principal stress on the ultimate strength for the concrete-filled tubular CFRP-steel stub column have been investigated. The ultimate load calculation formula for the concrete-filled tubular CFRP-steel stub column is derived in this paper, and can be simplified for cases without CFRP. Compared with the solution obtained in this paper and the experimental results, the good agreement can be found. The effects of the intermediate shear stress, the cross-section deformation ratio and also the inner friction angle of the concrete are all considered in the theory analysis. The analysis result further tests the applicability of the unified strength theory in the field of concrete-filled CFRP-steel tube. It has an important theory value for engineering application.

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